/*
 * Tencent is pleased to support the open source community by making BK-CI 蓝鲸持续集成平台 available.
 *
 * Copyright (C) 2020 THL A29 Limited, a Tencent company.  All rights reserved.
 *
 * BK-CI 蓝鲸持续集成平台 is licensed under the MIT license.
 *
 * A copy of the MIT License is included in this file.
 *
 *
 * Terms of the MIT License:
 * ---------------------------------------------------
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package com.tencent.bkrepo.common.security.http.jwt

import com.tencent.bkrepo.common.api.constant.AUTHORITIES_KEY
import com.tencent.bkrepo.common.api.constant.BEARER_AUTH_PREFIX
import com.tencent.bkrepo.common.api.constant.HttpHeaders
import com.tencent.bkrepo.common.security.crypto.CryptoProperties
import com.tencent.bkrepo.common.security.exception.AuthenticationException
import com.tencent.bkrepo.common.security.http.core.HttpAuthHandler
import com.tencent.bkrepo.common.security.http.credentials.AnonymousCredentials
import com.tencent.bkrepo.common.security.http.credentials.HttpAuthCredentials
import com.tencent.bkrepo.common.security.manager.AuthenticationManager
import com.tencent.bkrepo.common.security.util.JwtUtils
import com.tencent.bkrepo.common.security.util.RsaUtils
import io.jsonwebtoken.ExpiredJwtException
import io.jsonwebtoken.JwtException
import javax.servlet.http.HttpServletRequest

open class JwtAuthHandler(
    jwtAuthProperties: JwtAuthProperties,
    private val cryptoProperties: CryptoProperties,
    private val authenticationManager: AuthenticationManager
) : HttpAuthHandler {

    private val signingKey = JwtUtils.createSigningKey(jwtAuthProperties.secretKey)

    override fun extractAuthCredentials(request: HttpServletRequest): HttpAuthCredentials {
        val authorizationHeader = request.getHeader(HttpHeaders.AUTHORIZATION).orEmpty()
        return if (authorizationHeader.startsWith(BEARER_AUTH_PREFIX)) {
            val jwtToken = authorizationHeader.removePrefix(BEARER_AUTH_PREFIX).trim()
            return JwtAuthCredentials(jwtToken)
        } else AnonymousCredentials()
    }

    override fun onAuthenticate(request: HttpServletRequest, authCredentials: HttpAuthCredentials): String {
        require(authCredentials is JwtAuthCredentials)

        val token = authCredentials.token
        try {
            return validateToken { JwtUtils.validateToken(signingKey, token).body.subject }
        } catch (ignore: AuthenticationException) {
            // do nothing
        }

        return validateToken {
            val key = RsaUtils.stringToPublicKey(cryptoProperties.publicKeyStr2048PKCS8)
            val userId = JwtUtils.validateToken(key, token).body.subject
            val scope = authenticationManager.findOauthToken(token)?.scope
                ?: throw AuthenticationException("Invalid token")
            request.setAttribute(AUTHORITIES_KEY, scope)
            userId
        }
    }

    private fun validateToken(action: () -> String): String {
        try {
            return action()
        } catch (exception: ExpiredJwtException) {
            throw AuthenticationException("Expired token")
        } catch (exception: JwtException) {
            throw AuthenticationException("Invalid token")
        } catch (exception: JwtException) {
            throw AuthenticationException("Empty token")
        }
    }
}
